Nick Coghlan <ncogh...@gmail.com> added the comment:

Victor, please stop trying to conflate the two questions of "How should we fix 
the current Py_DecodeLocale regression before 3.7.0a3?" and "What do we want to 
do long term?".

They're far from being the same question, and answering the second one properly 
is going to be much harder and more involved than just doing the bare minimum 
needed to make the previously supported embedding logic work again (even if it 
means postponing some of the dynamic allocator changes we'd like to make).

Omitting PYTHONHOME and PYTHONPATH from the core config is deliberate, as the 
interpreter doesn't support external imports yet when just the core has been 
initialized - only builtin and frozen ones.

Anything related to external imports should ultimately end up in the main 
interpreter configuration: 
https://www.python.org/dev/peps/pep-0432/#supported-configuration-settings

Longer term, I also want to rewrite getpath.c in Python (or at least primarily 
using Python lists and strings via the C API instead of relaying C arrays and C 
string manipulation functions).

However, our work on refactoring Py_Main has also shown me that we're going to 
need some additional structs to hold the raw(ish) command line arguments and 
environment variables in order to easily pass them around to other internal 
configuration APIs.

Modules/main.c already defines _Py_CommandLineDetails for the command line 
settings: https://github.com/python/cpython/blob/master/Modules/main.c#L382

We *don't* currently have anything like that for environment variables, not 
even the ones which are "read once at startup, then never read them again".

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<https://bugs.python.org/issue32096>
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